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| Natura: | Preprint |
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2026
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| Accesso online: | https://arxiv.org/abs/2604.21802 |
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| _version_ | 1866908989753655296 |
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| author | Schmid, A. Siebenkotten, D. Dai, D. Godinho, J. Ostatnický, T. Zou, N. Zhang, Y. Železný, J. Šobáň, Z. Křížek, F. Novák, V. Fairman, S. Hoehl, A. Hertwig, A. Janda, T. Huber, M. A. Huber, R. Kästner, B. Wunderlich, J. |
| author_facet | Schmid, A. Siebenkotten, D. Dai, D. Godinho, J. Ostatnický, T. Zou, N. Zhang, Y. Železný, J. Šobáň, Z. Křížek, F. Novák, V. Fairman, S. Hoehl, A. Hertwig, A. Janda, T. Huber, M. A. Huber, R. Kästner, B. Wunderlich, J. |
| contents | Reading antiferromagnetic order remains a central obstacle for antiferromagnetic memory and logic because zero net magnetisation precludes conventional magnetic readout. Domain imaging typically relies on x-ray magnetic linear dichroism (XMLD) microscopy at synchrotron sources, but XMLD is even under time reversal and cannot distinguish 180°-reversed magnetic states. Here we report the first experimental observation of the optical nonlinear anomalous Hall effect, predicted for antiferromagnets with combined parity - time-reversal ($PT$) symmetry. The effect stems from light-induced interband electric-dipole transitions, where spin-orbit coupling induces an asymmetry between $\pm k$ states and generates a time-reversal-odd photocurrent whose sign flips upon 180° reversal of the Néel vector. In $PT$-symmetric CuMnAs, we use near-field excitation to map this photocurrent with sub-100-nm spatial resolution after current-induced spin-orbit-torque switching. The signal polarity follows local Néel vector reversal, enabling nanoscale imaging of antiferromagnetic texture and direct readout of 180°-reversed antiferromagnetic states that remain indistinguishable in XMLD and other time-reversal-even linear-dichroic probes. The optical nonlinear anomalous Hall effect thus reveals a new light-spin interaction and provides a scalable route to nanoscale readout of hidden spin order, with potential for ultrafast all-electrical and all-optical antiferromagnetic spintronic technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21802 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Optical nonlinear anomalous Hall effect reveals the hidden spin order in antiferromagnets Schmid, A. Siebenkotten, D. Dai, D. Godinho, J. Ostatnický, T. Zou, N. Zhang, Y. Železný, J. Šobáň, Z. Křížek, F. Novák, V. Fairman, S. Hoehl, A. Hertwig, A. Janda, T. Huber, M. A. Huber, R. Kästner, B. Wunderlich, J. Materials Science Reading antiferromagnetic order remains a central obstacle for antiferromagnetic memory and logic because zero net magnetisation precludes conventional magnetic readout. Domain imaging typically relies on x-ray magnetic linear dichroism (XMLD) microscopy at synchrotron sources, but XMLD is even under time reversal and cannot distinguish 180°-reversed magnetic states. Here we report the first experimental observation of the optical nonlinear anomalous Hall effect, predicted for antiferromagnets with combined parity - time-reversal ($PT$) symmetry. The effect stems from light-induced interband electric-dipole transitions, where spin-orbit coupling induces an asymmetry between $\pm k$ states and generates a time-reversal-odd photocurrent whose sign flips upon 180° reversal of the Néel vector. In $PT$-symmetric CuMnAs, we use near-field excitation to map this photocurrent with sub-100-nm spatial resolution after current-induced spin-orbit-torque switching. The signal polarity follows local Néel vector reversal, enabling nanoscale imaging of antiferromagnetic texture and direct readout of 180°-reversed antiferromagnetic states that remain indistinguishable in XMLD and other time-reversal-even linear-dichroic probes. The optical nonlinear anomalous Hall effect thus reveals a new light-spin interaction and provides a scalable route to nanoscale readout of hidden spin order, with potential for ultrafast all-electrical and all-optical antiferromagnetic spintronic technologies. |
| title | Optical nonlinear anomalous Hall effect reveals the hidden spin order in antiferromagnets |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.21802 |